Clarifying error message

This error will be triggered if either setting the group or the user is the problem.  Fixing the wording after being led astray tracking down issue that was group, not user, related.
Bug fix: get groupname of group rather than user
Add new feature, set file date to episode aired date. Fix, use alternative Trakt API field for episode air time. Improve the Preview Rename tip.

Add, new setting "Set File Date to Airdate" on the Media Management tab of the Settings page to toggle this feature for new, imported and auto updating media files.

Change, home page "Series Editor" - "Rename" button to "Update Files" and add "Set File Date To Air Date" action button to this modal to add capability of updating legacy media.

Add, non UTC functions given that Windows undesirably adds time to file times set when using UTC.

Fix, the Trakt API response show.air_time_utc contains erroneous data, this is replaced with show.air_time.
Fixed build.ps1 for osx package
Gracefully exit on restart instead of forcibly killing it
Update messenger instance if it was already created

Fixed: UI notifications don't bounce around when there is more than one
Don't clean common words from the start of the title

Fixed: Do not treat similar titles as the exact same
Fixed broken tests
Reverse proxy settings in UI
Fixed: UI notifications when using a reverse proxy
History check shouldn't die if download client is not configured.

Do not log exceptron response when no errors are found
New: Jump to page on tables (click on page number)
Show spinner when loading from dropdown
Fixed: Series editor saves much faster
Added info to device id for push over
Merge branch 'AirDate' of https://github.com/JackDandy/NzbDrone into set-file-date
Set episode file modified date to local or utc air date
Merge pull request #58 from TectonicEd/patch-1

Clarifying error message
Merge pull request #59 from TectonicEd/patch-2

Bug fix: get groupname of group rather than user
Major logging overhaul